fix bad amount clicking on pos meal voucher payment method

lacagette_addons/lacagette_mona/README.rst

+============================
+La Cagette - MonA
+============================
+
+This module extends the Point of Sale Odoo module, as well as the POS Meal Voucher module.
+
+MonA is the payment method of a Common Food Fund experimentation.
+The products elligible are the same as the ones elligible to Meal Vouchers.
+
+Configuration
+=============
+
+
+Payment Method
+~~~~~~~~
+
+Go to the payment methods and add/update the MonA payment method (needs to be done each time the module is uninstalled/reinstalled).
+"Type" should be "Bank".
+In the "Point of sale" tab, check the "Pay with MonA" checkbox.
+
+
+Point of sale
+~~~~~~~~
+
+Go to your point of sale and click on the "Activate MonA payment" checkbox.
+Add the MonA payment method to your point of sale.

lacagette_addons/pos_meal_voucher/static/src/js/screens.js

@@ -332,6 +332,12 @@ odoo.define("pos_meal_voucher.screens", function (require) {
                         
             // if user choose card meal voucher
             if(order.selected_paymentline.is_meal_voucher() && order.selected_paymentline.is_dematerialized_meal_voucher()){
+                // Set selected payment line amount to 0 before any further check
+                order.selected_paymentline.set_amount(0);
+                paymentScreen.order_changes();
+                paymentScreen.render_paymentlines();
+                paymentScreen.$(".paymentline.selected .edit").text(paymentScreen.format_currency_no_symbol(0));
+
                 // update selected (last) payment line & order with meal voucher data
                 function update_order_meal_voucher_data(issuer = '') {
                     var total_eligible = order.get_total_meal_voucher_eligible();